Recycling metals from lithium ion battery by mechanical separation and vacuum metallurgy
Recycling metals from lithium ion battery by mechanical separation and vacuum metallurgy
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通过机械分离和真空冶金回收锂离子电池中的金属
DOI：
10.1016/j.jhazmat.2017.05.024
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发表时间：
2017
影响因子：
13.6
通讯作者：
Xu Zhengming
中科院分区：
文献类型：
--
作者：
Xiao Jiefeng;Li Jia;Xu Zhengming
锂离子电池的大批量应用导致了废旧电池的大量产生。因此，提高废旧锂离子电池的处理能力变得十分迫切。本研究提出了一种综合工艺来处理散装废旧锂锰（LiMn2O4）电池，以原位回收高附加值产品，而无需任何添加剂。采用机械分离的方法，首次从废旧电池中得到了以粘结剂、石墨和LiMn2O4为主的混合电极材料。分析了混合电极材料无氧焙烧的反应特性。结果表明，混合电极材料在1073 K下反应45 min可原位转化为氧化锰（MnO）和碳酸锂（Li2CO3）。在此过程中，粘合剂被蒸发并分解成气体产物，这些气体产物可以被收集以避免处置成本。最后，将焙烧后的粉体用水浸出91.30%的Li资源Li2CO3，滤液蒸发进一步得到高附加值的Li2CO3晶体。滤渣在空气中燃烧以除去石墨，并获得最终残余物四氧化三锰（Mn3O4）。
The large-batch application of lithium ion batteries leads to the mass production of spent batteries. So the enhancement of disposal ability of spent lithium ion batteries is becoming very urgent. This study proposes an integrated process to handle bulk spent lithium manganese (LiMn2O4) batteries to in situ recycle high value-added products without any additives. By mechanical separation, the mixed electrode materials mainly including binder, graphite and LiMn2O4are firstly obtained from spent batteries. Then, the reaction characteristics for the oxygen-free roasting of mixed electrode materials are analyzed. And the results show that mixed electrode materials can bein situconverted into manganese oxide (MnO) and lithium carbonate (Li2CO3) at 1073 K for 45 min. In this process, the binder is evaporated and decomposed into gaseous products which can be collected to avoid disposal cost. Finally, 91.30% of Li resource as Li2CO3is leached from roasted powders by water and then high value-added Li2CO3crystals are further gained by evaporating the filter liquid. The filter residues are burned in air to remove the graphite and the final residues as manganous-manganic oxide (Mn3O4) is obtained.